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UNITED sTATEs PATENT oEEIoE.

CHAS. G. BLOOMER, OF NORTH KINGSTON, RHODE ISLAND.

OPERATING WINDOW-BLINDS.

Specification of Letters Patent No. 25,801, dated October 18, 1859 To all whom 'it may concern:

Be it known that I, CHARLES G. BLooMER, of North Kingston, in the county of Waslr ington and State of Rhode Island, have invented a new and useful Improvement in Means for Adjusting and Holding in Position the Slats of'Door or Window Blinds at any Desired Angle; and I do hereby declare that the following specification, taken in connection with the drawings making a part of the same, is a full, clear, and exact description thereof.

Figure, 1, is a perspective view of a pair of blinds with my improvement attached. Fig. 2 is a plan and side view of the parts composing the devices by which the result described is effected.

It is a matter of common experience that after the tenons to the slats of blinds have become worn, the slats have a tendency to turn downward, owing to the weight of the connecting rod, and thus when the blind is closed against the window admits the rays of the sun, and the rain.

Besides the convenience of being able to adjust and to hold the slats at any desired angle for the purpose of regulating the admission of light and air it is also desirable so to secure them that their positions cannot easily be changed from the outside.

To produce a device which when attached to one of the slats of a window blind shall render the blind capable of being adjusted and held at any angle and also secure the slats when closed, from the danger of being changed from the outside is the object of my improvement.

In order that my improvement may be understood I will proceed to describe its operation.

A, A, A are the slats of a blind constructed in the ordinary way and worked simultaneously by the connecting rod, B.

On the under face of the lowest slat (in the case shown in the drawing) either at the extremity of the slat or at any other place as may be found most convenient, I attach a disk of metal in the form of a segment of a circle, perpendicular to the face of the slat, as shown in the drawing, (C, Fig. 1)-the periphery of this metallic disk is provided with as many notches d, d, d as it is desired to have positions for the slats. Upon the bottom stile of the blind I attach a spring, or other equivalent instrument, having upon that part of its upper face which is under the periphery of the disk a tooth or projection, g, which by the upward tendency of the spring is made to engage with some one of the notches on the disk and thus hold the slat in the desired position (E Fig. l).

It is evident that the notches can be made either with the corners rounded, or straight, and in the latter case the slat could not be turned without rst unlocking it by depressing the spring. I have found it most convenient to make all the notches with rounded corners except the last which is made with a straight edge so that the blind can be operated by the rod except where turned flat in which position the slats are locked so that they cannot easily be moved from the outside.

It is evident that my improvement need not necessarily be attached to the lowest slat and bottom stile of a blind-the segmental disk can be attached to any one of the slats of the series and the spring catch be attached to either of the side stiles. I consider however the method shown in the drawings to be on the whole more convenient than any other.

What I claim as my invention and desire to secure by Letters Patent is The segmental disk D or its equivalent, and the spring F or its equivalent in combination with one of the slats of a blind, when arranged to operate in the manner substantially as described for the purposes specified.

CHAS. G. BLOOMER.

Witnesses:

JAMES M. RIPLEY, JOHN GARTLAND. 

